Plaster-board



C. R. BIBDStY. 'PLASTER BOARD.

APPLICATION FILED JAN.2. |920.

1,395,032, Patented Oct. 25, 1921.

j@ jy we UNITED STATES PATENT OFFICE.

CHARLES E. BIRDSEY, 0E HINsDALEILLINoIs, AssIGNoE, BY MESNE ASSIGNMENTS,To UNITED STATES GYPSUM COMPANY, 0E CHICAGO, ILLINOIS, A CORPORATION 0EILLINOIS.

:BLASTER-BOARD.

Specification of Letters Patent.

Patented Oct. 25, 1921.

To all whom t may concern: I

Be it known that I, CHARLES R. BIRDsEY, a citizen of the United States,residing at Hinsdale, in the county of Du Page and State of Illinois,have invented certain new and useful Improvementsl in Plaster-Board,(Case D,) of 'which the-following is a description.

My invention belongs to that general class of devices known as plasterboard or the like and relates particularly to a type of board in whichthe plaster, plaster Paris or equivalent plastic material issubstantially inclosed on both faces and on one or both opposite edges.The invention has among its objects the production of an improvedboard.. which fwill be simple, substantial, durable, satisfactory andeflicient and which may be economically and accurately manufactured, andin which the edges may be. perfectly formed to correspond to a definitespecification as to size and shape. Many other Objects and advantages ofthe construction herein shown and described will be obvious to thoseskilled in the art from the disclosure herein given.

To this end my invention consists of the novel construction, arrangementand combination of-parts herein shown and described and moreparticularly pointed out in the claims.

In the drawings, wherein like reference l characters indicatev like orcorresponding parts,

Figure 1 is a'sectional view through a portion of a plaster boardembodying the invention,

Fig. 2 is a perspective view of a portion of the same board,

Fig. 3 is a similar view of a slightly modified construction,

Fig. 4 is a sectional view of a portion of a board illustrating afurther step in the'construction, and f Fig. 5 is a view similar to Fig.2 of another form\ of board. f

Referring to the drawings, particularly Figs. 1 `and 2, 1 represents aboard of suitable material, as for example, plaster, plaster Paris, orany equivalent material suitable for the purpose which may be handled ina plastic state and thereafter allowed to set or harden. The body isinclosed by the covering sheets 2 and 3 of suitable material'and it maybe mentioned that I have found paper of the desired weight or thicknessvery satisfactory for the purpose.

In the type of board illustrated in Figs. 1 and 2 I inclose the one orboth side edges by a binder or strip 5 which covers the edge of theboardand is folded inwardly, as at 6 and 7, to overlie the two oppositesides of the faces of the board. The same is preferably scored at 8before folding, so as to give a straight or regular edge, the contour ofthe edge bein as desired. In constructing the board, preferably seal thesame by allowing a portion of the plastic body to flow in between thefaces of the sheets 2 and 3 and the folded-in edges 6 and 7 as indicatedat, 9. Any equivalent means for securing the folded-in edges to thecovering. sheets 2 and 3 maybe employed. v

In the construction shown in Fig. 3, the edge binder is similar to thatdescribed except that it is constructed to overlie the body but on theexterior ofthe covering sheets 12 and 13. Referring to this figure,

11 represents the body and 12 and 13 the covering sheets, while 15represents the binder having the extending folded-over edges 16 and v17,the same being preferably scored as at 18. In this case the same issealed between the covering sheets as indicated at 19. In Fig-1 it isillustrated how the parts may be so pressed or so formed that thefolded-over'ed es 16 and 17 will be substantially flush wit the exteriorfaces of the covering sheets 12 and 13.

In the construction shown in Fig. 5, 21 represents the body and 22 and28 the covering sheets. In this construction 25 represents the edgebinder which is folded overl as at 26 so as to overlie the body, thesame being positioned on the exterior, as shown, or on the interior sideof the covering sheets, as may be desired. The binder is preferablyfirst scored as at 28, or folded so as to produce a comparativelynniformedge. The edge 27 of the binder 25 may engage with the sheet 22, asshown, or at the edge.

It will be noted that with all of the conl struetions described, theedge is substantially would need to be inclosed. The resulting producthas a straight, smooth, finished edge and at a perfect angle the boardbeing uniform in Width throughout its ien th. The completedl product hasmany `a vantages and it has increased strength and durability and animproved appearance. In case of handlin the edges are protected andthere is no sifting or powdering of the body or breaking away of the ede.

. Having thus describe my invention, it

is obvious that various immaterial modifi-y cations may be made in thesame without departing from the spirit of my invention; hence I do notwish to be understood as limiting myself to thev exact form,construction, arrangement and combination of parts herein shown anddescribed or uses mentioned.

What I claim as new 4and desire to secure by Letters Patent is:

A plaster board comprising a suitable body, a cover sheet arranged oneach face thereof, and an edge binder strip at one edge of thebod foldedto overlie the/body at each fa'ce...t ereof, the cover sheet) and edge ibinder portion on each face of the body be# ing arranged to present alsubstantially continuous even outer face throughout the outer face ofthe board. .n

2. A plaster board of the lkind, described, comprising a suitable body,a cover sheet arranged Aat each face side thereof, and an edge binderarranged at each of the opposite edges and adherlng thereto, said binderfolded in to overlie the body at the interior of the cover sheets.

3. A plaster board of the kind described comprising a suitable body, acover sheet l arranged at each face side thereof, and separate edgebinder strips at opposite edges:

folded to overlie the body at each face side thereof, and separate edgebinder strips at opposite edges folded to overlie the body at each facethereof, the cover sheet and edge binder strip portion on each face ofthe. body being arranged to present a substantially continuous evenouter surface throughout the outer faces of the board.

In testimony whereof, I have hereunto signed my name in the presence oftwo subscribing witnesses.

p CHARLES R. BIRDSEY. Witnesses:

RoY W. HILL, CHARLES I. COBB.

